Pulverize weed and grass killer is a fast-acting, weed, grass, algae and moss killer. Incidental over spray will not stain concrete or pavement. Pulverize weed and grass killer is a non-selective herbicide that controls many common annual weeds. Pulverize weed and grass killer suppresses the growth of some bi-annuls and perennial weeds. It can be used in cultivated areas prior to planting grass or flowers. Best results are obtained with young, actively growing weeds, less than 5 in size.